A member of NASA's Advisory Council on Planetary Defense told the BBC he'd concluded "the super volcano threat is substantially greater than the asteroid or comet threat."
In my town it was cloudy all morning -- though I got a postcard from friends experiencing "the path of totality" in Idaho City. But how about you? How did you experience this week's solar eclipse?
Cassini's radar will be able to look into the atmosphere and see features as small as 16 miles (25 km) wide, about 100 times smaller than what it could see from its usual orbital positions. The Grand Finale will include one final swing by Saturn's largest moon, Titan, on Sept. 11. Titan's gravity will slow Cassini's orbit around Saturn and bend its path to send the spacecraft toward its September 15 encounter with the planet... Cassini will keep sending back data on September 15 until it gets to an altitude where atmospheric density is about twice what it encountered during its final five passes, NASA officials said. At that point, mission controllers will lose contact with the probe because its thrusters won't be able to keep Cassini's antenna pointed toward Earth; there will simply be too much air to push against.
The second dip happens this weekend, and NASA has created a special web page tracking Cassini's current location for its final 28 days.
The $408 million TDRS-M was built and launched with the sole purpose to extend the useful life of NASA's constant communications infrastructure, supporting the astronauts around-the-clock aboard the International Space Station, supplying contact with the Hubble Space Telescope and transmitting the data from almost 40 science spacecraft studying Earth's environment and space.
"Much of what happens in the world of cultured meat is done for the sake of PR," Ben Wurgaft, an MIT-based post-doctoral researcher writing a book on cultured meat, told Gizmodo. Wurgaft finds it hard to believe many predictions about cultured meat's future, including the promise of an FDA-approved consumer product within a year. The truth is that only a few successful prototypes have yet been shown to the public, including a NASA-funded goldfish-based protein in the early 2000s, and a steak grown from frog cells in 2003 for an art exhibit. More have come recently: Mark Post unveiled a $330,000 cultured burger in 2013, startup Memphis Meats has produced cultured meatballs and poultry last and this year, and Hampton Creek plans to have a product reveal dinner by the end of the year.
Manish Panjwani's Los Angeles-based astronomy product business, AgenaAstro, has sold three times its average monthly revenue in the past month. Ninety-five percent is related to the solar eclipse... Panjwani's eclipse glasses come from two NASA-approved sellers: Thousand Oaks Optical in Arizona and Baader Planetarium in Germany. He said he provided documentation to Amazon proving the products' authenticity weeks ago, with no response from Amazon. On Saturday morning, he woke up to 100 emails from customers after Amazon issued a recall for his products. "People have some of the best glasses in the world in their hands right now and they don't believe in that product," he said. "They're out there looking for something inferior." Panjwani said Amazon is temporarily retaining some of his profits because of the recall. He also has almost 5,000 glasses at an Amazon warehouse, which customers can no longer purchase. "That's just sitting there. I cannot sell it and I cannot get it back in time for the eclipse," he said.
So, assuming the August 15 SpaceX Falcon 9 rocket launch goes well, there will be a supercomputer headed into space -- using off-the-shelf hardware. Let's see if the idea pans out. "We may discover a set of parameters with which a supercomputer can successfully run for at least a year without errors," says Dr. Mark R. Fernandez, the mission's co-principal investigator for software and SGI's HPC technology officer. "Alternately, one or more components of the system will fail, in which case we will then do the typical failure analysis on Earth. That will let us learn what to change to make the systems more reliable in the future."
The article points out that the New Horizons spacecraft that just flew past Pluto has a 12MHz Mongoose-V CPU, based on the MIPS R3000 CPU. "You may remember its much faster ancestor: the chip that took you on adventures in the original Sony PlayStation, circa 1994."
Today, with NASA once again considering the challenges of sending astronauts to Mars, the nuclear option is back on the table as part of the agency's Game Changing Development program. Under this, NASA has awarded BMXT, which supplies nuclear fuel to the U.S. Navy, a $18.8-million contract running through September 30, 2019 to look into the possibility of developing a new engine using a new type of fuel. Unlike previous designs using highly enriched uranium, BMXT will study the use of Low-Enriched Uranium (LEU), which has less than 20 percent of fissile uranium 235. This will provide a number of advantages. Not only is it safer than the highly enriched fuel, but the security arrangements are less burdensome, and the handling regulations are the same as those of a university research reactor. If NASA determines next month that the LEU engine is feasible, the project will conduct testing and refine the manufacturing process of the Cermet fuel elements over the course of a year, with testing of the full-length Cermet fuel rods to be conducted at Marshall.
Slashdot reader Big Hairy Ian adds: "At the very least it looks much more feasible than Project Orion."
The New York Times fondly profiles Voyager's nine aging flight-team engineers who "may be the last people left on the planet who can operate the spacecraft's onboard computers, which have 235,000 times less memory and 175,000 times less speed than a 16-gigabyte smartphone." NASA reports that now "Voyager 1 is in 'Interstellar space' and Voyager 2 is currently in the 'Heliosheath' -- the outermost layer of the heliosphere where the solar wind is slowed by the pressure of interstellar gas. " But the Times notes that the probes "are running out of fuel. (Decaying plutonium supplies their power.) By 2030 at the latest, they will not have enough juice left to run a single experiment."
NASA is now inviting the public to submit positive messages to be considered for beaming into space on September 5th -- the 40th anniversary of Voyager 1's launch. "Messages can have a maximum of 60 characters and be posted on Twitter, Instagram, Facebook, Google+ or Tumblr using the hashtag #MessageToVoyager," until August 15th, after which humanity will vote on which message should be sent.